clothing from yard sales and thrift stores are the best supply of wools- you can get so much great wool fabric very inexpensively that way- compared to $20+ a yard for new wools.
i have found looking at garments as if browsing a fabric store is a great way to yard sale! you can find colors-patterns you can not find in yardage- and a shirt, skirt, dress or jacket all contain ALOT of fabric!